Highly Efficient and Thermally Stable Broadband NIR Phosphors with Superlong Afterglow Performance and their Multifunctional Applications

Laser & Photonics Review, Год журнала: 2024, Номер 18(10)

Опубликована: Май 16, 2024

Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are considered as promising next‐generation light sources for optoelectronic and biomedical applications. Nevertheless, NIR phosphors with large bandwidths, long emission peaks, high external quantum efficiencies (EQEs) valuable thermal stabilities challenging to develop. Herein, this study reports a novel gallium germanate host, Ga 3 Al Ge 2 O 13 (GAGO), bandgap rigid host lattice Cr 3+ ion doping. The blue LED excitable GAGO:0.012Cr phosphor can produce broadband maximum intensity at 816 nm full‐width half‐maximum (FWHM) of 187 nm. Notably, the also exhibits an excellent EQE 35.8% perfect stability (I 423 K /I 298 = 67.4%). Moreover, attractive afterglow duration more than 24 h is achieved in GAGO:0.004Cr phosphor. type origin traps discussed, possible persistent luminescent (LPL) mechanism proposed. Finally, pc‐LED based on fabricated. results demonstrate that obtained show great potential use night vision, nondestructive detection, bioimaging information encryption. This provides new insight into development materials efficiency, good extraordinary performance.

Язык: Английский

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Efficient Ultra‐Broadband Ga₄GeO₈:Cr³⁺ Phosphors with Tunable Peak Wavelengths from 835 to 980 nm for NIR pc‐LED Application

Advanced Optical Materials, Год журнала: 2021, Номер 10(4)

Опубликована: Дек. 18, 2021

Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) hold great potential for applications ranging from night vision to non‐destructive detection. However, it remains a long‐standing challenge develop NIR phosphors simultaneously with longer‐wavelength broadband emissions and higher efficiency. Herein, ultra‐broadband Ga 4 GeO 8 :Cr 3+ (GGO:Cr ) are developed, the emission covering 700–1300 nm. Furthermore, tunable bands peaking 835 980 nm achieved simply by varying Cr concentration. Particularly, maxima (λ max of GGO: x shift 850 900 without intensity loss when increasing values between 0.02 0.10. An internal quantum yield 60% is GGO:0.02Cr ≈ nm, full width at half maximum (FWHM) ≈215 nm). The origin GGO:Cr revealed on basis structural time‐resolved spectroscopic analysis. pc‐LED fabricated exhibits output power ≈56 mW 400 mA drive current, its application in high‐penetration quality analysis fruits also demonstrated. results indicate that have high promise practical devices.

Язык: Английский

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Two Selective Sites Control of Cr³⁺‐Doped ABO₄ Phosphors for Tuning Ultra‐Broadband Near‐Infrared Photoluminescence and Multi‐Applications

Laser & Photonics Review, Год журнала: 2021, Номер 16(2)

Опубликована: Дек. 11, 2021

Abstract Achieving ultra‐broadband and tunable photoluminescence of near‐infrared (NIR) emitting phosphors is a key challenge for realizing its multi‐applications. Here, series new ABO 4 :Cr 3+` (A 3+ = Ga, Sc, In; B 5+ Ta, Nb) NIR‐emitting with unprecedented based on crystallographic site engineering crystal field regulation reported. Large spectral tuning from NIR‐I to NIR‐II realized the peak position varying 825 1025 nm, by cation substitution decreasing strength. Broadened full‐width at half maximum 125 231 nm can be tailored controlling occupancy Cr two different sites. Potential multi‐applications NIR are proposed validated in spectroscopy detection, night vision, penetrating biology tissue, so on. This work demonstrates that effectively tune optical properties ‐doped phosphor materials multi‐photoelectric applications.

Язык: Английский

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Controlling Cr3+/Cr4+ concentration in single-phase host toward tailored super-broad near-infrared luminescence for multifunctional applications

Materials Today Chemistry, Год журнала: 2021, Номер 22, С. 100555 - 100555

Опубликована: Сен. 11, 2021

Язык: Английский

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Octahedron-dependent near-infrared luminescence in Cr3+-activated phosphors

Materials Today Chemistry, Год журнала: 2021, Номер 23, С. 100704 - 100704

Опубликована: Дек. 13, 2021

Язык: Английский

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